The rear passenger footwell in my 85 300td used to fill with water regularly. I drilled a small hole in the low part and it has been dry ever since. I got tired of wringing out wet, dirty, cold towels.

Tiny rust spots on the front fender are gone too. There are only holes there now. Simple.

__________________
2009 E320 Bluetec 117,000
1995 E300D 306,000 Sold
1996 Ford Taurus LX 130,000 Sold
1985 300TD Still 225,000 Sold
2016 Ford Fusion 24,900